42,

43.

44.

45,

46.

47.

48.

49,

50,

Which one of the following law is helpful to determine the most economical size of the electric
power transmission line conductor ?

(ಹ) Ohms Law (B) Kirchoff's Laws (ಲ) Faradays Law (D) Kelvin's Law

Three 100 Q resistances are connected in delta and are connected to a 400 V, 3 phase, and
50 Hz ac supply. If one of the resistance is burned out what will be the reduction in power
consumption ?

(ಹ) 400 W (B) 800W © 1600 W (D) 3200

What will be the value of the regulation of the single phase transformer with percentage
resistance drop 2% and percentage reactance drop 8% at a power factor of unity.

@) 2 ൫ 5 © 8 യു 10

A 30 kVA Delta bank is created by using 3 similar single phase transformers. When one of
the transformer is removed then what will be the capacity in kVA of the new
arrangement ?

(ಹ) 127 ൫ 173 © 20 യു 30

A standard incandescent lamp having a lumen intensity of 160 Cd in all directions gives an
illuminance of 40 lux at the surface of a table vertically below the lamp. What is the distance
of the lamp above the table ?

(ಹ) 18 (8) 28 (ಲ) 38 D) 4m

Which one of the following is not the name of ACSR Conductor ?
(ಹ) ಹಗ ட 02௦௦ (© WOLF (D) TIGER

Saving of copper in an autotransformer, compared to ordinary transformer is given by
times weight of copper in ordinary transformer.

@) X ® 1/K © ‏عد‎ യു ‏وحو/د‎

Calculate the number of sub circuits required for an electrification circuit which contains 28
lamps of 100 W.

@ 1 ® 2 © 3 യു 4

Calculate the number of street lights required for 3 km long street which is to be illuminated
by 85 W sodium vapour lamp at a span of 30 meter.

(ಹ) 98 ൫ 99 © 100 യ) 101

029/2018 8 A